Audi Turbocharger Issue

40

Asked by pshue62 May 23, 2018 at 06:24 PM about the 2009 Audi A4 2.0T quattro Premium Sedan AWD

Question type: Maintenance & Repair

I own a 2009 Audi A4 Turbo, 152,000 mile, new engine at 68,000. The check engine light came on a few days ago and I had it checked today.  The repair person told me the code was Turbo Charger Under Boost.  Can someone help me what that means please?  I've driven the car the last 2 days with the light on.  Should I stop driving it?  Is this a big problem?

4 Answers

17,660

According to my Audi Shop Service Manual, this would be Error Code P0299,Turbo/Super Charger Underboost. The manual says that the most common cause for this condition is a faulty wastegate bypass regulator valve created by 1- Mechanical damage at turbo/super charger, 2- Faulty charge air pressure sensor. Most noticeable symptom is a mild to sever lost of boost power or complete turbo failure. Recommendation: Have technician conduct a complete inspection of the part(s) in question and conduct pressure test for possible leak.

8 people found this helpful.
339,965

It may mean you need a new turbo but I would check to see if the air filter is dirty. What did the mechanic say about it?

2 people found this helpful.
40

The car seems to be running ok but the mil light will not go off. I was very low in gas on Monday and it came on also before I could get gas. He ran a scan or diagnostic, whatever its called, and he said the scanner was displaying Engine - Turbo Underboost. Thanks for your reply.

4 people found this helpful.
17,660

The car seems to be running ok but the mil light will not go off. I was very low in gas on Monday and it came on also before I could get gas. He ran a scan or diagnostic, whatever its called, and he said the scanner was displaying Engine - Turbo Underboost. Thanks for your reply."

1 people found this helpful.

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